Masm indirect addressing mode for MOV commmand -

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I have tried the following forms and not like any of them: 

  Mov byte [marivale], al wax byte ptr [merivable], al mov [byte marial], al

What am I missing? Why can not I use an indirect address

On some incorrect lines, the "missing operator is missing the expression", some of them say "the structure area is expected" 

  myVariable equ 0404h

does not declare a variable, it replaces all constants with their values ​​in a continuous object file . Therefore, 

  mov [myVariable] becomes al  

  mov [0404h], al

that is invalid.

You must assign a value to a register, such as: 

  mov di, 0404h mov byte PTR [D], AL

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